Scalable video coding and decoding methods, and scalable video encoder and decoder

Abstract

Scalable video coding and decoding methods, a scalable video encoder, and a scalable video decoder. The scalable video coding method includes receiving a GOP, performing temporal filtering and spatial transformation thereon, quantizing and generating a bitstream. The scalable video encoder for performing the scalable video coding method includes a weight determination block which determines a weight for scaling. The scalable video decoding method includes dequantizing the coded image information obtained from a received bitstream, performing descaling, inverse spatial transformation, and inverse temporal filtering on the scaled transform coefficients, thereby recovering video frames. The scalable video decoder for performing the scalable video decoding method includes an inverse weighting block. The standard deviation of Peak Signal to Noise Ratios (PSNRs) of frames included in a group of pictures (GOP) is reduced so that video coding performance can be increased.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to video compression, and more particularly, to scalable video coding and decoding methods using a weight, and an encoder and a decoder using the methods, respectively. 2. Description of the Related Art With the development of information communication technology including the Internet, video communication as well as text and voice communication has increased. Conventional text communication cannot satisfy the various demands of users, and thus demand for multimedia services that can provide various types of information such as text, pictures, and music have increased. Multimedia data requires a large capacity storage medium and a wide bandwidth for transmission since the amount of multimedia data is usually large. For example, a 24-bit true color image having a resolution of 640*480 needs a capacity of 640*480*24 bits, i.e., data of about 7.37 Mbits, per frame. When this image is transmitted at...

AI Technical Summary

Benefits of technology

The present invention provides scalable video coding and decoding methods allowing changes in Pea

Problems solved by technology

Conventional text communication cannot satisfy the various demands of users, and thus demand for multimedia services that can provide various types of information such as text, pictures, and music have increased.

Multimedia data requires a large capacity storage medium and a wide bandwidth for transmission since the amount of multimedia data is usually large.

These methods have satisfactory compression rates, but they do not have the flexibility of a truly scalable bitstream since they use a reflexive approach in a main algorithm.

However, conventional IWVC ha

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